After last theme update (12/05/2019), The search button in top menu is out of order!
Also, the a part of Cart menu is hidding back to Main menu.
I think you have the same problems in your demo site.
Unfortunately, this is a bug and we will be resolving it soon in our next update.
We are sorry for the inconvenience you may be facing.
In the meantime, if you need to implement this now, you can do this via a custom CSS.
Follow the below steps to add custom CSS.
1) Please log in to the admin area
2) Go to “Appearance >> Customize >> Additional CSS”.
3) Paste the below code in “Additional CSS” and save it afterward: